From a941b784b15ff65e1a3b6a259c6d6cf7fa0bb3c3 Mon Sep 17 00:00:00 2001 From: Nipun Gupta Date: Fri, 15 Sep 2023 10:24:21 +0530 Subject: cdx: add support for bus mastering Introduce cdx_set_master() and cdx_clear_master() APIs to support enable and disable of bus mastering. Drivers need to use these APIs to enable/disable DMAs from the CDX devices. Signed-off-by: Nipun Gupta Reviewed-by: Pieter Jansen van Vuuren Link: https://lore.kernel.org/r/20230915045423.31630-1-nipun.gupta@amd.com Signed-off-by: Alex Williamson --- include/linux/cdx/cdx_bus.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'include/linux/cdx/cdx_bus.h') diff --git a/include/linux/cdx/cdx_bus.h b/include/linux/cdx/cdx_bus.h index bead71b7bc73..8320ec3b9e37 100644 --- a/include/linux/cdx/cdx_bus.h +++ b/include/linux/cdx/cdx_bus.h @@ -21,11 +21,13 @@ struct cdx_controller; enum { + CDX_DEV_BUS_MASTER_CONF, CDX_DEV_RESET_CONF, }; struct cdx_device_config { u8 type; + bool bus_master_enable; }; typedef int (*cdx_scan_cb)(struct cdx_controller *cdx); @@ -170,4 +172,20 @@ extern struct bus_type cdx_bus_type; */ int cdx_dev_reset(struct device *dev); +/** + * cdx_set_master - enables bus-mastering for CDX device + * @cdx_dev: the CDX device to enable + * + * Return: 0 for success, -errno on failure + */ +int cdx_set_master(struct cdx_device *cdx_dev); + +/** + * cdx_clear_master - disables bus-mastering for CDX device + * @cdx_dev: the CDX device to disable + * + * Return: 0 for success, -errno on failure + */ +int cdx_clear_master(struct cdx_device *cdx_dev); + #endif /* _CDX_BUS_H_ */ -- cgit v1.2.3